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2. Model ECH3 Electrical Control Head.
Once the thermal detectors have been installed, the control head can be placed in the set position. To set the control head, the slide plate is moved from right to left, ensuring the bolt extending from the cam arm is in the slot provided in the slide plate. Continue moving the slide plate to the left until the latching arm is in the locked position. Insert the pull pin into the hole in the slide plate above the latching arm. This will lock the control head in the set position, eliminating accidental actuation during the rest of the installation procedure.
Once the Model ECH3 Electrical Control Head is in the set position, it can be connected to the detection/actuation circuit.
NOTE: No electrical connections shall be made inside the control head. All electrical wiring shall exit the control head through the knock-out on the side of the box. All electrical connections must be made in the approved electrical box.
Connect one of the black wires on the solenoid in the control head to the red wire of the Model MS-SPDT Miniature Switch. The brown wire from the miniature switch is then connected to one side of the first thermal detector in series. Connect to other side of the first thermal detector in series and remaining black wire on the solenoid in the control head to the appropriate power source after installing the Model SM-24/120 Solenoid Monitor.
CAUTION: The solenoid must never be wired "hot" ( not through the micro-switch). If wired this way, the non-field replaceable solenoid will be damaged and the complete control head will require replacement.
NOTE: A Model SM-24/120 Solenoid Monitor must always be used with an Electrical Control Head to supervise the actuation/detection circuit. Where electrical detection and/or actuation is provided, supervision shall be provided in accordance with NFPA-17A. Alarms and indicators along with a supervised backup power source shall be installed in accordance with NFPA 72. The National Fire Alarm Code. Electrical wiring and equipment shall be installed in accordance with NFPA 70, National Electric Code or the requirements of the authority having jurisdiction.
The Model ECH3-24 Electrical Control Head requires a 24VDC power supply with a minimum 2A rating. The Model ECH3-120 Electrical Control Head requires a 1A, 120VAC power supply.
SOLENOID MONITOR INSTALLATION
1. Solenoid Monitor Installation in Detection Circuit.
After installing the thermal detectors and the control head, the Model SM-120/24 Solenoid Monitor can be installed. The Solenoid Monitor is connected to the wires leading from the last thermal detector, it should be mounted in a location where it can be readily observed.
The Solenoid Monitor is an end-of-line device that supervises the actuation/detection circuit. It is comprised of a push-type switch with a built-in indicator light, a plug-type relay, a relay socket, and a cover plate. The light, when illuminated, indicates that the detection/actuation circuit is in the normal condition. The Solenoid Monitor also provides two sets of dry contacts. The Solenoid Monitor's cover plate is used to mount the Solenoid Monitor in a standard 6" x 4" x 3" (15 x 10 x 8 cm) deep electrical box. See Figure 4-14.
All wires for circuits using the Model SM-24 shall be 18 gauge minimum, or as required by local code. All wire for circuits using the Model SM-120 shall be 14 gauge minimum, or as required by local code. The basic wiring diagrams for both the Model SM-24 and Model SM-120 is shown in Figure 4-14.1.
After the Solenoid Monitor has been installed, the detector/actuation circuit can be connected to the appropriate power source and energized. To energize the detector/actuation circuit, depress the switch on the Solenoid Monitor. The light will illuminate will indicate that the circuit is properly installed. If the light fails to illuminate, the wiring must be checked.
